PSI - Issue 2_A

Morozov V.A. et al. / Procedia Structural Integrity 2 (2016) 1002–1006 Author name / Structural Integrity Procedia 00 (2016) 000–000

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Fig. 4. The structure of the cross-sections of aluminum rings: (a) caprolactan elastomer; (b) PMMA elastomer; (c) fluoroplastic elastomer.

On fig.4b (PMMA elastomer) it is seen most advanced dynamic recrystallization - the largest number of formed grains. Probably, maximum hardness of this sample (Table 2) it is connected with this. 4. Conclusions Thus, the study showed the following: 1) Electrical explosion of conductors is quite suitable for the study of the deformation and fracture of the ring specimens at strain rates of ~10 4 1⁄с; 2) Among three used materials, in which an electrical explosion of conductors was produced, the most suitable appeared to be fluoroplastic, both in terms of re-usable, and to generate higher amplitude of voltage pulses; 3) Most embrittlement occurs in aluminum sample loaded at the maximum strain rate and at the maximum circumferential pressure in the ring (when tested with the elastomer - fluoroplastic); 4) The most developed dynamic recrystallization and maximum hardness was found in an aluminum sample when tested with the PMMA elastomer. Acknowledgements Work was nancially supported by grants RFBR 16-01-00638, RFBR-NSFC 16-51-53006, and by St. Petersburg State University (Project no. 6.39.319.2014). References Zhang H., Ravi Chandar K., 2006. On the dynamics of necking and fragmentation – I. Real-time and post-mortem observations in Al 6061-O. Int. J. Fract. 142, 183-217. Morozov V.A., Petrov Yu.V., Lukin A.A., Katz V.M., Udovik A.G., Atroshenko S.A., Fedorovskii G.D., 2011. Metal-ring stretching under magnetic-pulse shock action. Doklady Physics, 56 (8), 452-454. Morozov V.A., Petrov Y.V., Lukin A.A., Atroshenko S.A., Gribanov D.A., 2014. Fracture of metallic rings during magnetic-pulse shock loading. Technical Physics, 59 (9), 1338-1345. Imbert J., Rahmaan T., Worswick M. 2015. Interrupted pulse electromagnetic expanding ring test for sheet metal. EPJ Web of Conferences 94, 01048.